[GHC] #9049: Expose srcLoc from the assertion architecture to allow better error messages

[GHC]

#9049: Expose srcLoc from the assertion architecture to allow better error
messages
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              Reporter:  nh2         |            Owner:  gridaphobe
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.2
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 Replying to [comment:16 gridaphobe]:
 > One use-case that the implicit parameters approach supports that neither
 -prof nor -g really do is reifying the source locations to a data
 structure that your haskell program can process.

 Yes.  So (importantly) let's not just give access to a `String` but rather
 to a proper data structure with line number, module, package etc.  We
 should use the same data structures for this purpose as the
 `StaticPtrInfo` fields in [wiki:StaticPointers/ImplementationPlan].  The
 latter are not yet well fleshed out, and advertised as subject to change.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9049#comment:18>
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